NPDES permits in Rhode Island
14 permits held by publicly owned wastewater treatment plants · issued by RIDEM
Effective
10
Administratively continued
4
Expired
0
Total tracked
14
Rhode Island Department of Environmental Management (RIDEM) runs the NPDES program in Rhode Island under delegation from EPA Region 1, issuing and enforcing the discharge permits listed here. Klarifi tracks 14 permits held by publicly owned treatment plants in the state, with status, expiry, design flow and three-year compliance for each. Agency website →
An NPDES permit runs for five years. To keep discharging, a plant must apply for renewal at least 180 days before the expiry date, and the renewed permit usually arrives with tighter effluent limits, new monitoring requirements or a compliance schedule. That is why the year a permit expires is the year a plant starts budgeting for upgrades: nutrient removal, disinfection, capacity or controls.
Permit renewals by year
2026: 2 permits
2028: 3 permits
2029: 3 permits
2030: 3 permits
Largest permit holders in Rhode Island
| Facility | City | Avg flow (MGD) | Design (MGD) | NPDES permit | Status | Expires | Violations (3y) |
|---|---|---|---|---|---|---|---|
| Narragansett Bay Commission Bucklin Point | East Providence (rumford) | 16.27 | — | RIR50T002 | Effective | Aug 2029 | 8 |
| East Providence WWTF | East Providence | 4.4 | 14.2 | RI0100048 | Effective | Sep 2028 | 70 |
| Newport Water Pollution Control Facility | Newport | 5.3 | 10.7 | RI0100293 | Administratively continued | May 2020 | 24 |
| Cranston Water Pollution Control Facility | Cranston | 5.3 | — | RIL100013 | Effective | Dec 2030 | 6 |
| Bristol Wastewater Treatment Facility | Bristol | 2.14 | 3.79 | RI0100005 | Effective | Mar 2028 | 25 |
| Smithfield Wastewater Treatment Plant | Smithfield | 1.35 | 3.5 | RI0100251 | Administratively continued | Jun 2026 | 3 |
| Warren WWTF | Warren | 1.19 | 3.43 | RI0100056 | Effective | Dec 2030 | 56 |
| Westerly Wastewater Treatment Facility | Westerly | 1.56 | 3.3 | RI0100064 | Effective | Sep 2026 | 7 |
| Quonset Point Wastewater Treatment Facility | North Kingstown | 0.41 | 1.78 | RI0100404 | Effective | Dec 2030 | 74 |
| East Greenwich WWTF | East Greenwich | 0.63 | 1.7 | RI0100030 | Administratively continued | Sep 2023 | 7 |
| Burrillville Wastewater Treatment Plant | Burrillville | 0.66 | 1.5 | RI0100455 | Administratively continued | Jun 2025 | 36 |
| Scarborough Wastewater Treatment Facility | Narragansett | 0.39 | 1.4 | RI0100188 | Effective | Sep 2028 | 113 |
| Jamestown Wastewater Treatment Facility | Jamestown | 0.1 | 0.73 | RI0100366 | Effective | Jun 2029 | 112 |
| New Shoreham WWTF | New Shoreham | 0.17 | 0.45 | RI0100196 | Effective | Jun 2029 | 149 |
All 14 plants in Rhode Island →
NPDES permits in Rhode Island: questions
Sources and methodology
Flow, permit and violation figures come from the EPA's ICIS-NPDES discharge monitoring records. Population served comes from the Clean Watersheds Needs Survey 2022. Treatment structures are identified by Klarifi's review of aerial imagery, and capital improvement projects are extracted from published municipal budget documents. Violations are counted over the last three years of monitoring reports.
Data refreshed September 11, 2026.